Tír Na HiFi

I've been using one of Ian Canada's UCPi boards set to 3.3V to power a Raspberry Pi DAC with good success. He has 2 325F-350F 2.7V Ultracaps in series with a 1K resistor across each which is supposed to keep them fairly balanced. I charge them together with a single 3.3V LT3042-based regulator that ...

Randy / Nige, Thanks. I did figure removing the isolators and using a reclocker at the DAC would also make a useful improvement. One of my Soekris setups is fed from an SDTrans384. I will be using that one to compare the SDTrans to the the EBay cheapie SD card as a source. That'll be the one I'll in...

Thanks Nige! I didn't mention in my earlier note, but I've gone to LCR polystyrene for the output low-pass filter caps. Nicely detailed, natural, and extended highs with no noticeable emphasis or tizziness. Much better than the Panasonic PPS SMD film caps, MUCH MUCH better than the stock ceramic cap...

Sorry I haven't been around much for awhile... working on other audio projects and non-audio stuff. But I think it's time to get back here and get some work done on the cheapie Chinese SD card players that are becoming the rage here! First, I want to be clear... my linear-reg modified RPi's IMHO get...

First, some background... Early this summer, I took the mods on my DAM1021 Rev1's almost as far as one could go without going to LiFePO4 or Ultracap power, as documented here and in a few following posts: https://www.diyaudio.com/forums/digital-line-level/267948-soekris-dac-implementations-post54838...

@jkeny, Ian has not reported that online yet, which is why I was a little reserved on the details. He was charging it via one of his LT3042 reg boards. I don't have much more info than that. I agree that the constantly-charged UC is the most convenient option and I'm interested in getting it as clos...

John & others... The concurrent charging scenario is not dead. It did not win in Ian's early trials. I'll setting up some alternatives to try including pure Ultracap and some concurrent charging alternatives. I'm hopeful the latter can be made to equal or come very close to the pure UC setups.. ...

All, I'm looking to buy an SLC card to compare to the $$$$ Sony and the regular ones I have. From browsing the thread, what I think I need to get is the Panasonic Industrial SLC, which I see for 8Gb @ $133 USD. I also see a some labeled 'PE Consumer Plus SLC-Lite' (16Gb $55) and 'C+ SLC-Lite' (32Gb ...

@microyzma, I've got an SDTrans384 too along with a couple of the same SD card players from China that Nige modified to try. BUT, I have a stack-up on projects to work and at best I don't expect to get to working on and trying the Chinese SD card players until late this summer at best. Also I can't ...

On a lark, I decided to put in the ldovr 1.2V regulator with my meter in-line to measure the current. I mostly have CD rips, with very little hi-rez. When powered on, it read about 50mA. Playing, about 100mA. While I can see some activities that could possibly increase the current draw dramatically,...